linux-kernel - [PATCH 3.13 050/160] ath9k: Fix sequence number assignment for non-data frames

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Message-Id: <1402429600-20477-51-git-send-email-kamal@canonical.com>
Date:	Tue, 10 Jun 2014 12:44:50 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Felix Fietkau <nbd@...nwrt.org>,
	Helmut Schaa <helmut.schaa@...glemail.com>,
	"John W. Linville" <linville@...driver.com>,
	Fejes József <jozsef.fejes@...il.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 050/160] ath9k: Fix sequence number assignment for non-data frames

3.13.11.3 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Helmut Schaa <helmut.schaa@...glemail.com>

commit 5998be879719384af2014b79697eed6e38ee2706 upstream.

Since commit 558ff225de80ac95b132d3a115ddadcd64498b4f (ath9k: fix
ps-poll responses under a-mpdu sessions) non-data frames would have
gotten a sequence number from a TIDs sequence counter instead of
using the global sequence counter.

This can lead to instable connections.

To fix this only select the correct TID if we are processing a
data frame. Furthermore, prevent non-data frames to get a sequence
number from a TID sequence counter by adding a check to
ath_tx_setup_buffer.

Cc: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: Helmut Schaa <helmut.schaa@...glemail.com>
Acked-by: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: John W. Linville <linville@...driver.com>
Cc: Fejes József <jozsef.fejes@...il.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/wireless/ath/ath9k/xmit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 0471c6a..6fa2d35 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -2074,7 +2074,7 @@ static struct ath_buf *ath_tx_setup_buffer(struct ath_softc *sc,
 
 	ATH_TXBUF_RESET(bf);
 
-	if (tid) {
+	if (tid && ieee80211_is_data_present(hdr->frame_control)) {
 		fragno = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 		seqno = tid->seq_next;
 		hdr->seq_ctrl = cpu_to_le16(tid->seq_next << IEEE80211_SEQ_SEQ_SHIFT);
@@ -2197,7 +2197,7 @@ int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
 		txq->stopped = true;
 	}
 
-	if (txctl->an)
+	if (txctl->an && ieee80211_is_data_present(hdr->frame_control))
 		tid = ath_get_skb_tid(sc, txctl->an, skb);
 
 	if (info->flags & IEEE80211_TX_CTL_PS_RESPONSE) {
-- 
1.9.1

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